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run code in 150+ php & hhvm versions
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<?php $a = array('1' => true, '2' => true,); unset($a[1]); var_dump($a, array_keys($a));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [2]=> bool(true) } array(1) { [0]=> int(2) }